To cook a frozen beef roast without defrosting it first, simply allow 50 percent more cooking time than the recipe specifies. All other steps remain the same.
Season the frozen beef roast as you normally do before cooking. Place vegetables, seasonings and liquids in the slow cooker or roasting pan with the frozen roast as usual. Cook the roast to an internal temperature of 145 degrees Fahrenheit.
If desired, sear the beef roast before slow cooking or baking to impart depth and flavor. Simply place the frozen roast into a bowl of hot water to soften the outside of the meat. Then season it, and sear until browned. Proceed to bake or slow cook the meat as normal.
It is safe to cook a frozen beef roast on the grill, on the stove or in the oven. The manufacturers of Crock-Pot ensure consumers that it is safe to cook a frozen beef roast in the slow cooker, as long as the consumer pours a cup of water into the cooker before adding the roast, does not preheat the cooker, and cooks the beef roast for an extra two hours on high or an extra four to six hours on low.